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Pol 05 Noise attenuation

Number of credits available Minimum standards
1 No

Aim

To reduce the likelihood of noise arising from fixed installations on the new development affecting nearby noise-sensitive buildings.

Assessment Criteria

The following is required to demonstrate compliance for:

One credit

  1. The credit can be awarded by default where there are or will be no noise-sensitive areas or buildings within 800m radius of the assessed development.
  2. Where there are or will be noise-sensitive areas or buildings within 800m radius of the assessed development a noise impact assessment in compliance with BS 74451BS 7445:1 Description and measurement of environmental noise, Part 1: Guide to quantities and procedures, British Standards Institute, 2003.BS 7445:2 Description and measurement of environmental noise, Part 2: Guide to the acquisition of data pertinent to land use, British Standards Institute, 1991.BS 7445:3 Description and measurement of environmental noise, Part 3: Guide to application to noise limits, British Standards Institute, 1991. has been carried out and the following noise levels measured/determined:
    1. Existing background noise levels at the nearest or most exposed noise-sensitive development to the proposed development or at a location where background conditions can be argued to be similar.
    2. The rating noise level resulting from the new noise-source (see also Compliance note: Compliance at the design stage).
  3. The noise impact assessment must be carried out by a suitably qualified acoustic consultant holding a recognised acoustic qualification and membership of an appropriate professional body (see Relevant definitions in the Additional Information section).
  4. The noise level from the proposed site/building, as measured in the locality of the nearest or most exposed noise-sensitive development, is a difference no greater than +5dB during the day (07:00 hr to 23:00 hr) and +3dB at night (23:00 hr to 07:00 hr) compared to the background noise level.
  5. Where the noise source(s) from the proposed site/building is greater than the levels described in criterion 4, measures have been installed to attenuate the noise at its source to a level where it will comply with criterion 4.

Compliance Notes

Ref

Terms

Description

CN1 

Shell only

Where the specification and installation of building services systems within the building/tenanted areas will be the responsibility of the future tenant, the acoustician will need to make an assumption for the worst case noise rating level. This can be based upon reference to servicing strategy/installations and sites similar to that of the assessed building or on a maximum design fit out specification.

Alternatively, compliance with this BREEAM issue can be demonstrated via one of the following means:

  1. Option 1 – Use of a tenancy lease agreement between the developer and tenant/s (full value of available credits)
  2. Option 2 – A Green Building Guide for tenant fit outs (half the value of the available credits)
  3. Option 3 – Developer/Tenant collaboration (full value of available credits)

. Refer to Appendix D of this Scheme Document for further description of the above options.

CN2 

Attenuating noise at its source See criteria 4 & 5 BS 8233:19992BS 8233 Sound insulation and noise reduction for buildings, Code of practice, British Standards Institute, 1999. gives recommendations for the control of noise in and around buildings. Confirming the specification of attenuation measures in accordance with this Code of Practice can be used as a method of demonstrating compliance with criterion no.4.

CN3 

Compliance at the design stage See criterion 2

At the design stage of assessment, where noise sensitive areas or buildings are present, actual measurement is unlikely to be possible due to the planned but non existent installation. In such situations compliance can be demonstrated through the use of acousticians’ calculations or by scale model investigations. For such cases BS7445-2 states that “as universally agreed prediction models do not exist, the method adopted should be carefully described in the acoustician’s report”. And that “when available, prediction models accepted by relevant authorities should be used.”

Where prediction through these methods is not possible, measurement will be necessary using either a noise source similar to that proposed or, alternatively, measurement of the actual noise from the installation (once installed); compliance with the latter approach requires a written commitment to appoint a suitable qualified acoustician to carry out the required measurements post installation, and a further commitment to attenuate the noise source in compliance with criteria 4 and 5 of BREEAM (if proved necessary by the measurements)

CN4 

Untreated buildings This assessment issue does not apply to buildings designed to be untreated i.e. where internal spaces will not be serviced by heating, ventilation or air conditioning systems and therefore no noise generating plant. Examples of such building types could include industrial warehouse storage.

Schedule of Evidence

Ref Design stage
Post-construction stage
1

Design drawings highlighting:

  1. All existing and proposed noise-sensitive buildings local to, and within, the site boundary
  2. Proposed sources of noise from the new development
  3. Distance (m) from these buildings to the assessed development.

BREEAM Assessor’s site inspection report and photographic evidence confirming:

  1. All noise-sensitive buildings local to, and within, the site boundary
  2. Proposed noise sources within the development
  3. Distances (m) from these buildings to the assessed development.
2-3

The acoustician’s report, acoustician’s qualifications and professional status.

OR

Relevant section/clauses of the building specification or contract requiring a noise assessment by a suitably qualified acoustician in compliance with BS 7445:1991.

OR

A letter from the client or design team confirming that they will appoint an acoustician to carry out a noise assessment in compliance with BS 7445:1991

The acoustician’s report with measurements based on installed and operating plant.
4

Acoustician’s report with recommendations for noise attenuation measures.

AND EITHER

A marked-up design plan highlighting the specification of the acoustician’s attenuation measures

OR

A formal letter from the client or design team confirming where relevant, that attenuation measures recommended by an appointed suitably qualified acoustician will be installed.

BREEAM Assessor’s site inspection report and photographic evidence confirming the existence of the specified noise attenuation measures.

OR

A letter from the acoustician confirming that all specified attenuation measures have been installed to the required standard.

Additional Information

Relevant definitions

Suitably qualified acoustician
An individual who holds a recognised acoustic qualification and membership of an appropriate professional body. The primary professional body for acoustics in the UK is the Institute of Acoustics.
Noise sensitive area
Landscapes or buildings where the occupiers are likely to be sensitive to noise created by the new plant installed in the assessed building, including:
    Residential areas
    Hospitals, health centres, care homes, doctor’s surgeries etc.
    Schools, colleges and other teaching establishments.
    Libraries
    Places of worship
    Wildlife areas, historic landscapes, parks and gardens.
    Located in an area of Outstanding natural beauty or near a Site of Special Scientific Interest (SSSI).
    Any other development that can be considered noise sensitive.

Checklists and Tables

None

Calculation procedures

None

Other information

None

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